CVE-2026-47040: Vulnerability in the Oracle Net Services component of Oracle Database Server

This month

CRITICAL 9.1REMOTEUPGRADE

CVE-2026-47040 is a critical-severity flaw (CVSS 9.1) affecting database server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Vulnerability in the Oracle Net Services component of Oracle Database Server. Supported versions that are affected are 19.3-19.31, 21.3-21.22 and 23.4.0-23.26.2. Easily exploitable vulnerability allows unauthenticated attacker with network access via Oracle Net to compromise Oracle Net Services. Successful attacks of this vulnerability can result in unauthorized access to critical data or complete access to all Oracle Net Services accessible

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.5% (top 58%)
CISA exploited list	No
Weakness	CWE-306
Published	2026-07-21
Last modified	2026-10-24

Publisher (CNA): Oracle · Vendor: oracle

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-07-21 22:17 UTCPublished CVE record published
2026-10-24 19:10 UTCUpdated Record last modified

oracle database server UPGRADE

Affected: >= 19.3 and <= 19.31 · >= 21.3 and <= 21.22 · >= 23.4 and <= 23.26.2

Fixed in: newer than 23.26.2

Safe to downgrade to: a release before 19.3

1. Check installed version

apt-cache policy database-server || rpm -q database-server || database-server --version

2. UPGRADE to newer than 23.26.2 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade database-server

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade database-server

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 19.3 (Debian / Ubuntu)

apt-cache madison database-server sudo apt install database-server=<VERSION_BEFORE_19.3> sudo apt-mark hold database-server

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list database-server sudo dnf downgrade database-server-<VERSION_BEFORE_19.3> sudo dnf versionlock add database-server

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-47040?

database server: upgrade to newer than 23.26.2. Exact commands for each OS are on this page.

Is CVE-2026-47040 being exploited?

CVE-2026-47040 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-47040 affect?

CVE-2026-47040 affects database server. Severity is critical (CVSS 9.1). Vulnerability in the Oracle Net Services component of Oracle Database Server. Supported versions that are affected are 19.3-19.31, 21.3-21.22 and 23.4.0-23.26.2. Easily exploitable vulnerability allows unauthenticated attacker with networ

How urgent is CVE-2026-47040?

Priority 47/100. Critical severity; Remotely exploitable, no login, no user action

Software pages

Oracle Database vulnerabilities

Related CVEs

CVE-2026-47046 HIGH 8.2 UPGRADE Vulnerability in the RDBMS component of Oracle Database Server
CVE-2026-60175 HIGH 8.8 UPGRADE Vulnerability in the RDBMS component of Oracle Database Server
CVE-2026-47045 MEDIUM 6.8 UPGRADE Vulnerability in the JDBC component of Oracle Database Server
CVE-2026-46975 MEDIUM 5.8 UPGRADE Vulnerability in the RDBMS component of Oracle Database Server
CVE-2026-47060 MEDIUM 6.5 UPGRADE Vulnerability in the JDBC component of Oracle Database Server

References

← Back to latest CVEs